Good Riddles

Question: I can be flipped and broken but I never move. I can be closed, and opened, and sometimes removed. I am sealed by hands. What am I?

Question: If 1+9+8=1, what is 2+8+9?

Question: What jumps when it walks and sits when it stands?

Question: A blue man lives in a blue house. A green man lives in a green house. Who lives in the white house?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?